package com.zhang.spark_1.spark_core.operator.transform

import org.apache.spark.rdd.RDD
import org.apache.spark.{SparkConf, SparkContext}

/**
 * @title:
 * @author: zhang
 * @date: 2021/12/5 18:51 
 */
object Spark06_RDD_Operator_Transform_Test {

  def main(args: Array[String]): Unit = {
    //获取spark的连接
    val conf: SparkConf = new SparkConf().setMaster("local[*]").setAppName("operator")
    val sc: SparkContext = new SparkContext(conf)
    //TODO groupBy 小功能：将List("Hello", "hive", "hbase", "Hadoop")根据单词首写字母进行分组。
    val rdd: RDD[String] = sc.makeRDD(List("Hello", "hive", "hbase", "Hadoop"),2)

    val rddGroup: RDD[(Char, Iterable[String])] = rdd.groupBy(_.charAt(0))

    rddGroup.collect().foreach(println)
    sc.stop()
  }
}
